how to put it back to the original file?

[Hiei-YYH]

Elden Ring issue...

Extracted "item.msgbnd.dcx" then got a folder called "item" and a few other subfolders... then got the file "AccessoryCaption.fmg" and extracted, it's now a normal TXT file... ok, i can edit but how to put it back to the "fmg" and then back to "item.msgbnd.dcx" format so i can put into the mod folder with modengine2 or repack with UXM? any help or other tool to do this?

[Atvaark]

I don't know any repacking tools. You should ask the project you mentioned or their community.